[Meta-analysis of clinical trials for chemotherapy in cancer]

Meta-analysis has attracted great interest among clinical practitioners in recent years, leading to a steady output of related publications. Meta-analytic articles are easily found in the MEDLINE database using the publication-type option. This paper reviews how to use and understand meta-analysis with a special reference to chemotherapy applied to cancer patients. It is described in relationship to evidence-based medicine (EBM) and clinical practice guidelines. Cochrane collaboration is also referred to as an active voluntary organization conducting meta-analysis. In the technical sections, statistical issues and graphic representations are clearly illustrated using the example of hepatic arterial infusion for colorectal cancer patients. The difference between fixed and random effects models is briefly explained. Finally, an example from Cochrane Library, namely progestagen therapy for endometrial cancer, is illustrated to show the implications of meta-analysis for clinical practice.